WO2009145103A1 - Objectif et dispositif de capture optique - Google Patents

Objectif et dispositif de capture optique Download PDF

Info

Publication number
WO2009145103A1
WO2009145103A1 PCT/JP2009/059341 JP2009059341W WO2009145103A1 WO 2009145103 A1 WO2009145103 A1 WO 2009145103A1 JP 2009059341 W JP2009059341 W JP 2009059341W WO 2009145103 A1 WO2009145103 A1 WO 2009145103A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
path difference
optical path
objective lens
providing structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/059341
Other languages
English (en)
Japanese (ja)
Inventor
満 三森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Opto Inc
Original Assignee
Konica Minolta Opto Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Opto Inc filed Critical Konica Minolta Opto Inc
Priority to US12/994,446 priority Critical patent/US8385181B2/en
Priority to CN2009801188513A priority patent/CN102037512B/zh
Priority to JP2009546544A priority patent/JP4502079B2/ja
Publication of WO2009145103A1 publication Critical patent/WO2009145103A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1367—Stepped phase plates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Definitions

  • the optical system for high-density optical discs and the optical system for DVDs and CDs must be shared in compatible optical pickup devices. It is preferable to reduce the number of optical components constituting the optical pickup device as much as possible. And, it is most advantageous to simplify the configuration of the optical pickup device and to reduce the cost to make the objective lens arranged facing the optical disc in common.
  • an optical path difference providing structure having wavelength dependency of spherical aberration is formed in the objective optical system. It is necessary to reduce the spherical aberration caused by the difference in wavelength and the thickness of the protective layer.
  • the objective lens according to claim 5 is the objective lens according to any one of claims 1 to 4, wherein the first optical path difference providing structure passes through the first optical path difference providing structure.
  • the first-order diffracted light amount of one light beam is made larger than any other order (including zero-order) diffracted light amount
  • the -1st-order diffracted light amount of the second light beam that has passed through the first optical path difference providing structure Is larger than the diffracted light amount of any order (including the 0th order)
  • the ⁇ 2nd order diffracted light amount of the third light flux that has passed through the first optical path difference providing structure is set to any other order (including the 0th order).
  • the first optical path difference providing structure that is Comparative Example 2 shown in FIG. 11B has the diffraction characteristics shown in FIG. More specifically, the first-order diffracted light of the first wavelength has a peak value near 405 nm, the second-order diffracted light of the second wavelength has a peak value near 680 nm, and the -3rd-order diffracted light of the third wavelength has a peak value of 800 nm. It has a peak value at much higher wavelengths. Therefore, when a light beam having a wavelength of about 405 nm is used as the first light beam and a light beam having a wavelength of about 655 nm is used as the second light beam, a diffraction efficiency close to the peak value of the waveform can be obtained.
  • the objective lens according to claim 8 is characterized in that, in the invention according to any one of claims 1 to 7, the amount of step between adjacent steps in the step unit is substantially equal.
  • optical pickup device described in claim 14 is characterized in that, in the invention described in any one of claims 11 to 13, only the lowest step satisfies the expression (1).
  • the first light source, the second light source, and the third light source may be unitized.
  • the unitization means that the first light source and the second light source are fixedly housed in one package, for example. However, the unitization is not limited to this, and the two light sources are fixed so that the aberration cannot be corrected. Is widely included.
  • a light receiving element to be described later may be packaged.
  • the objective lens refers to an optical system that is disposed at a position facing the optical disk in the optical pickup device and has a function of condensing the light beam emitted from the light source onto the information recording surface of the optical disk.
  • the objective lens is an optical system which is disposed at a position facing the optical disk in the optical pickup device and has a function of condensing a light beam emitted from the light source on the information recording surface of the optical disk, and further includes an actuator An optical system that can be integrally displaced at least in the optical axis direction.
  • the objective lens is preferably a single objective lens, but may be formed of a plurality of optical elements.
  • the flare may be a spot peripheral portion around the spot center portion where the light density is high and there is no spot middle portion, and the light spot density is lower than the spot center portion.
  • the periphery of the spot is called flare.
  • the third light flux that has passed through the second optical path difference providing structure provided in the peripheral region of the objective lens may form such a spot peripheral portion on the information recording surface of the third optical disc.
  • the diffraction efficiency for each wavelength in the central region can be set as appropriate according to the application of the optical pickup device.
  • the diffraction efficiency of the central region and / or the peripheral region is expressed as It is preferable to set with emphasis.
  • the second and third light fluxes are emphasized with respect to the diffraction efficiency of the central region. It is preferable to set the diffraction efficiency of the peripheral region with the second light flux as important.
  • ⁇ represents the effective diameter of the objective lens when the first optical disk is used.
  • An optical information recording / reproducing apparatus includes an optical disc drive apparatus having the above-described optical pickup apparatus.
  • the third optical path difference providing structure makes the third-order diffracted light amount of the first light beam that has passed through larger than any other order diffracted light amount. Note that the ratios of the areas of the central region, the peripheral region, and the outermost peripheral region in FIGS. 5A and 5B are not accurately represented.
  • Polarized light is converted by the / 4 wavelength plate and enters the objective lens OBJ.
  • the light beam condensed by the central region and the peripheral region of the objective lens OBJ (the light beam that has passed through the most peripheral region is flared and forms a spot peripheral part) is passed through the protective substrate PL2 having a thickness of 0.6 mm.
  • the spot is formed on the information recording surface RL2 of the DVD, and the center of the spot is formed.
  • the ⁇ 1st order diffracted light of the second light beam generated in the central region and the ⁇ 1st order diffracted light of the second light beam generated in the peripheral region are collected on the information recording surface of the DVD.
  • the pitch of the diffractive structure is determined by an integer part of the optical path difference function of Formula 2, and the optical path length given to the light flux of each wavelength for each ring zone is expressed by the function of Formula 3 in the table. It is defined by a mathematical formula into which the coefficient shown is substituted.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

L'invention porte sur un dispositif de capture optique et sur un objectif qui peuvent enregistrer et/ou lire de façon appropriée des informations sur trois types de disques ayant différentes densités d'enregistrement et améliorer l'efficacité d'utilisation de lumière à l'aide d'une structure simple. Une première structure conférant une différence de trajet optique est formée sur la surface optique de l'objectif. La première structure conférant une différence de trajet optique a une structure à étages dans laquelle des unités d'étage en forme de bande annulaire ayant le même nombre d'étages sont agencées dans une pluralité de formes concentriques avec l'axe optique en tant que centre. La largeur w1 dans la direction perpendiculaire à l'axe optique de l'étage le plus élevé ou de l'étage le plus bas d'au moins une unité d'étage dans la structure à étages est approximativement la moitié de la valeur moyenne w2 des deux étages de chaque côté de l'étage le plus élevé ou de l'étage le plus bas, dans la direction perpendiculaire à l'axe optique.
PCT/JP2009/059341 2008-05-27 2009-05-21 Objectif et dispositif de capture optique Ceased WO2009145103A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/994,446 US8385181B2 (en) 2008-05-27 2009-05-21 Objective lens and optical pickup apparatus
CN2009801188513A CN102037512B (zh) 2008-05-27 2009-05-21 物镜及光拾取装置
JP2009546544A JP4502079B2 (ja) 2008-05-27 2009-05-21 対物レンズ及び光ピックアップ装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008138021 2008-05-27
JP2008-138021 2008-05-27

Publications (1)

Publication Number Publication Date
WO2009145103A1 true WO2009145103A1 (fr) 2009-12-03

Family

ID=41376981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/059341 Ceased WO2009145103A1 (fr) 2008-05-27 2009-05-21 Objectif et dispositif de capture optique

Country Status (4)

Country Link
US (1) US8385181B2 (fr)
JP (2) JP4502079B2 (fr)
CN (1) CN102037512B (fr)
WO (1) WO2009145103A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012111554A1 (fr) * 2011-02-17 2012-08-23 コニカミノルタオプト株式会社 Lentille d'objectif et dispositif de lecture optique
JP2012189966A (ja) * 2011-03-14 2012-10-04 Kansai Univ 集光フィルム及び太陽電池モジュール

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011122090A1 (fr) * 2010-03-30 2011-10-06 コニカミノルタオプト株式会社 Moule, élément optique et procédé de fabrication d'un élément optique
KR20140106055A (ko) * 2013-02-25 2014-09-03 도시바삼성스토리지테크놀러지코리아 주식회사 광픽업 및 이를 채용한 광정보저장매체 시스템
TWI772387B (zh) * 2017-03-17 2022-08-01 日商大日本印刷股份有限公司 繞射光學元件
JP7196406B2 (ja) * 2017-03-17 2022-12-27 大日本印刷株式会社 回折光学素子
JP2019086296A (ja) * 2017-11-01 2019-06-06 株式会社ミツトヨ 光学式エンコーダおよびこれを備えた測定器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005141800A (ja) * 2003-11-04 2005-06-02 Konica Minolta Opto Inc 発散角変換素子及び光ピックアップ装置
JP2007294101A (ja) * 2004-04-12 2007-11-08 Konica Minolta Opto Inc 対物レンズ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6515955B2 (en) * 2000-04-14 2003-02-04 Pentax Corporation Objective optical system for optical pick-up
TWI239520B (en) * 2001-10-12 2005-09-11 Konica Corp Objective lens, optical element, optical pick-up apparatus and optical information recording and/or reproducing apparatus equipped therewith
JP5002118B2 (ja) * 2003-06-18 2012-08-15 コニカミノルタアドバンストレイヤー株式会社 光ピックアップ装置用の光学素子、及び光ピックアップ装置
JP4677275B2 (ja) 2005-04-27 2011-04-27 Ｔｏｗａ株式会社 電子部品用のエキスパンド装置
CN101034570A (zh) * 2006-03-07 2007-09-12 柯尼卡美能达精密光学株式会社 光拾取装置、对物光学元件和光信息记录重放装置
TWI394152B (zh) * 2007-07-30 2013-04-21 Sony Corp Objective lens, optical read / write head and optical disc device
JP4775422B2 (ja) * 2008-08-28 2011-09-21 ソニー株式会社 集光光学デバイス、光ピックアップ及び光ディスク装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005141800A (ja) * 2003-11-04 2005-06-02 Konica Minolta Opto Inc 発散角変換素子及び光ピックアップ装置
JP2007294101A (ja) * 2004-04-12 2007-11-08 Konica Minolta Opto Inc 対物レンズ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012111554A1 (fr) * 2011-02-17 2012-08-23 コニカミノルタオプト株式会社 Lentille d'objectif et dispositif de lecture optique
JP2012189966A (ja) * 2011-03-14 2012-10-04 Kansai Univ 集光フィルム及び太陽電池モジュール

Also Published As

Publication number Publication date
JP2010044861A (ja) 2010-02-25
JP4502079B2 (ja) 2010-07-14
CN102037512B (zh) 2012-08-29
US20110075546A1 (en) 2011-03-31
JPWO2009145103A1 (ja) 2011-10-13
US8385181B2 (en) 2013-02-26
CN102037512A (zh) 2011-04-27

Similar Documents

Publication Publication Date Title
JP5136810B2 (ja) 光ピックアップ装置
WO2010013616A1 (fr) Lentille d'objectif et dispositif optique de capture
JP4502079B2 (ja) 対物レンズ及び光ピックアップ装置
JPWO2007145202A1 (ja) 光学素子の設計方法、光学素子及び光ピックアップ装置
JPWO2009154072A1 (ja) 対物レンズ、光ピックアップ装置及び光ディスクドライブ装置
JP2008293630A (ja) 光ピックアップ装置及び対物光学素子
JPWO2009116385A1 (ja) 対物レンズ及び光ピックアップ装置
JP4453785B2 (ja) 光ピックアップ装置用の対物レンズ及び光ピックアップ装置
JPWO2007123112A1 (ja) 光ピックアップ装置、光学素子及び光情報記録再生装置並びに光学素子の設計方法
WO2009128445A1 (fr) Lentille de focalisation et dispositif de détection optique
JP2009110591A (ja) 対物レンズ及び光ピックアップ装置
JP2007128654A (ja) 多焦点対物レンズ、光ピックアップ装置及び光情報記録再生装置
JP2010055683A (ja) 対物光学素子及び光ピックアップ装置
JP4385902B2 (ja) 対物光学素子及び光ピックアップ装置
JP2010153006A (ja) 対物光学素子及び光ピックアップ装置
JP2010055732A (ja) 対物光学素子及び光ピックアップ装置
JPWO2010089933A1 (ja) 対物レンズ及び光ピックアップ装置
JP5408549B2 (ja) 光ピックアップ装置用の対物レンズ及び光ピックアップ装置
JPWO2009147942A1 (ja) 対物レンズ及び光ピックアップ装置
JPWO2011114895A1 (ja) 対物レンズ、光ピックアップ装置及び光情報記録再生装置
JPWO2009051019A1 (ja) 光ピックアップ装置、光ピックアップ装置用の対物光学素子及び光情報記録再生装置
JPWO2010067733A1 (ja) 対物レンズ及び光ピックアップ装置
WO2011148832A1 (fr) Objectif pour tête optique, tête optique et dispositif de lecture et d'écriture d'informations optiques
JP2011248936A (ja) 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置
JPWO2011040225A1 (ja) 回折素子及び光ピックアップ装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200980118851.3

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2009546544

Country of ref document: JP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09754611

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 12994446

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09754611

Country of ref document: EP

Kind code of ref document: A1